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Regex in C# - how to apply the expression

Regular expressions, or regex, are used to describe sets of strings. For this purpose, syntactic rules are used, which are mainly used in software development. Regex is also frequently used in the C# programming language as a filter criterion to search for a specific pattern.

How to use regex in C#

The C# programming language is used in various areas of computer science. As in other languages, you can use regular expressions to search for patterns in a text or other areas. To search for sets of strings that meet certain criteria in C# as well, you need to follow few rules.
  1. For example, if you are searching for a particular string in a string in C#, you need to create a regex first. For this you need to include "using System.Text.RegularExpressions".
  2. Then select "Regex regex = new Regex()". As an argument, pass the characters you want to find. For example, if it is all numbers of any length, then write "Regex regex = new Regex("[0-9]+")".
  3. Following, the regex class of C# provides you with more methods to check for a match. The method "isMatch(String test)" will return "true" or "false" depending on whether the characters occur in the string.
  4. Another option is to use the Match() method. This returns an instance of the Match class. So you can use the "Success" call to check if there was a match. With "Value" you can output this afterwards.

By Marion

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